package com.itheima.ssm.controller;

import com.itheima.ssm.domain.SysLog;
import com.itheima.ssm.service.ISysLogService;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.annotation.After;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.security.core.context.SecurityContext;
import org.springframework.security.core.context.SecurityContextHolder;
import org.springframework.security.core.userdetails.User;
import org.springframework.stereotype.Component;
import org.springframework.web.bind.annotation.RequestMapping;
import sun.security.util.SecurityConstants;

import javax.servlet.http.HttpServletRequest;
import java.lang.reflect.Method;
import java.util.Date;

@Component
@Aspect
public class LogApp {

    @Autowired
    private ISysLogService sysLogService;

    @Autowired
    private HttpServletRequest request;

    private Date visitTime;//开始时间
    private Class clazz;//访问的类
    private Method method;//访问的方法
    /**
     * 前置通知,主要是获取时间，执行的类是哪一个，执行的是哪一个方法
     * @param jp
     */
    @Before("execution(* com.itheima.ssm.controller.*.*(..))")
    public void doBefore(JoinPoint jp) throws NoSuchMethodException {
        visitTime = new Date();//当前时间就是开始访问的时间
        clazz = jp.getTarget().getClass();//具体要访问的类
        String methodName = jp.getSignature().getName(); //获取访问的方法的名称
        Object[] args = jp.getArgs();//获取访问的方法的参数
        if (args == null || args.length == 0){
            method = clazz.getMethod(methodName); //只能获取无参数的方法
        }else {
            Class[] classArgs = new Class[args.length];
            for (int i = 0;i < args.length;i++){
                classArgs[i] = args[i].getClass();
            }
            clazz.getMethod(methodName,classArgs);
        }
    }

    /**
     * 后置通知
     * @param jp
     */
    @After("execution(* com.itheima.ssm.controller.*.*(..))")
    public void doAfter(JoinPoint jp) throws Exception {
        long time = new Date().getTime() - visitTime.getTime();

        String url = "";
        //获取url
        if (clazz != null && method != null&&clazz == LogApp.class){

            //1.获取类上的@RequestMapping("/order")
            RequestMapping classAnnotation = (RequestMapping) clazz.getAnnotation(RequestMapping.class);
            if (classAnnotation != null){
                String[] classValue = classAnnotation.value();

                //2.获取方法上的@RequestMapping(xxx)
                RequestMapping methodAnnotation = method.getAnnotation(RequestMapping.class);
                if (methodAnnotation != null){
                    String[] methodValue = methodAnnotation.value();

                    url = classValue[0] + methodValue[0];
                }
            }
        }
        //获取访问的ip地址
        String ip = request.getRemoteAddr();

        //获取当前操作用户
        SecurityContext context = SecurityContextHolder.getContext();//从上下文中获得了当前登录的用户
        User user = (User)context.getAuthentication().getPrincipal();
        String username = user.getUsername();

        //将日志相关信息封装到SysLog对象
        SysLog sysLog = new SysLog();
        sysLog.setExecutionTime(time);
        sysLog.setIp(ip);
        sysLog.setMethod("[类名]" + clazz.getName() + "[方法名]" + method.getName());
        sysLog.setUrl(url);
        sysLog.setUsername(username);
        sysLog.setVisitTime(visitTime);

        //调用service完成操作
        sysLogService.save(sysLog);

    }
}
